Thanks for writing to us.
The persistant dry caugh could be due to prodrome of respiratory infection/persistant allergy
to a particular allergen.
The cause of infection has to be investigated with throat swab culture/blood (AEC)and urinalysis
including CXR PA View.An empirical antibiotic till the reports arrive to be taken.
The best medicine for suppressing dry caugh is codeine
sulphate/phosphate/lintus codeine .As it is habit forming ,it has to be taken with caution.It has the side effect of inducing constipation
After the reports are received a specific therapy can be taken up.
Wishing a speedy recovery.,
Dr Lt Cdr ASN Bhushan.